CN109490415A - A kind of pipe detection system of the multi-channel parallel excitation and acquisition of multi-frequency switching - Google Patents
A kind of pipe detection system of the multi-channel parallel excitation and acquisition of multi-frequency switching Download PDFInfo
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- CN109490415A CN109490415A CN201811457209.5A CN201811457209A CN109490415A CN 109490415 A CN109490415 A CN 109490415A CN 201811457209 A CN201811457209 A CN 201811457209A CN 109490415 A CN109490415 A CN 109490415A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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Abstract
The present invention provides the pipe detection systems of the multi-channel parallel excitation and acquisition of a kind of switching of multi-frequency, it include: sensor module, channel selection switch, signal processing module, data memory module, MCU controller, frequency generation module and communication module, sensor module is connected with channel selection switch, channel selection switch is connected with signal processing module, signal processing module is connected with data memory module, data memory module is connected with MCU controller, MCU controller is connected with frequency generator and communication module, and communication module is connected with PC machine.Energy pipe detection system of the present invention can freely select required driving frequency to adapt to different types of pipeline and defect, and the output signal smooth steady under different frequency, undistorted phenomenon；Can also multi-channel parallel excitation and acquisition, and motivate it is synchronous with acquisition progress, detection efficiency height.
Description
Technical field
The present invention relates to multi-channel parallel excitations and acquisition that pipe detection field more particularly to a kind of multi-frequency switch
Pipe detection system.
Background technique
Pipeline is widely used in the industrial departments such as petroleum, chemical industry, natural gas, tap water and electric power, to state
The effect of people's economy and social development is huge.Due to being washed away and corroded plus artificial destruction by transport object for a long time,
The defects of pipeline is usually cracked, oxidation, wall pipe are thinned, seriously threatens the safety of life and property of the people.Traditional
Ultrasonic detecting technology detects necessary point by point scanning when pipeline, and speed is slow, low efficiency, and most of is that computer, function occur
The problems such as device, power amplifier, oscillograph, sensor etc. are applied in combination, and face complicated for operation, and wiring is complicated, cumbersome, because
This is not used to long range, large-scale pipe detection.A few money ultrasonic detectors of domestic small part company design, Zhi Nengdan
Channel actuation, excitation are separated with acquisition, and detection efficiency is low, job insecurity.
Chinese invention patent (application number 201520106714.0) discloses a kind of ultrasonic wave detecting system.The system is treated
It surveys steel workpiece to be detected, ultrasonic probe is placed on workpiece surface, when encountering defect, ultrasound detection circuit feeds back to list
Piece machine, single-chip microcontroller control liquid crystal display, show the waveform of a back wave, this position of abscissa is exactly defect in quilt
The depth in material is detected, but the system directly removes acquisition signal from ultrasonic probe, there is no carry out well to pumping signal
Processing, therefore it cannot be guaranteed that the data that single-chip microcontroller finally acquires are exactly the signal of defect.
Chinese invention patent (application number 201320196631.6) discloses a kind of SCM Based ultrasound examination dress
It sets.The device can adjust the width of driving pulse and the amplification factor of repetition rate and amplifying circuit while also be able to achieve letter
Number real-time display, storage and and the functions such as external communication, but the device cannot achieve multi-channel parallel excitation and acquisition,
Detection efficiency is low, and frequency can only repeat and cannot facilitate switching, therefore its defect that can not adapt to different types of workpiece, may be used also
There can be distorted signals.
Detection function machine system development (Beijing Institute of Petrochemical Technology's journal second phase of volume 14) in long distance pipeline ultrasonic wave,
The mechanism system is made of 5 subsystems in article: ultrasound detection subsystem, positioning subsystem, data acquisition transmission storage
System, power subsystem.The subsystem integration degree utilized in the system is not high, and required hardware device is more, thus
Increase the difficulty of construction.
Summary of the invention
Present invention aims to overcome that the shortcomings of the prior art, to provide a kind of multichannel of multi-frequency switching simultaneously
The pipe detection system of row energization and acquisition.
To achieve the above object, the present invention provides the pipelines of the multi-channel parallel excitation and acquisition of a kind of switching of multi-frequency
Detection system, comprising: sensor module, channel selection switch, signal processing module, data memory module, MCU controller, frequency
Module and communication module occur for rate,
The sensor module includes A ring and B ring, and the A ring and B ring include the identical multiple pressure sensors of quantity,
Multiple pressure sensors of the A ring and multiple pressure sensors of B ring are corresponding with multiple switch in output channel selection switch
It is connected；Multiple switch in multiple pressure sensors of the A ring and multiple pressure sensors of B ring and input channel selection switch
It is corresponding to be connected；
The channel selection switch includes output channel selection switch and input channel selection switch, the output channel choosing
Selecting switch includes multiple switch, and quantity is twice of pressure sensor quantity in A ring or B ring, to be sent out according to MCU controller
The control signal control A ring or B ring sent is as excitation ring；The input channel selection switch includes multiple switch, quantity A
Twice of pressure sensor quantity in ring or B ring, to the control signal control A ring sent according to MCU controller or B ring conduct
Receive ring；
The signal processing module includes multichannel pumping signal processing identical with pressure sensor quantity in A ring or B ring
Module and acquisition signal processing module, every road pumping signal processing module motivate memory block and defeated with one in data memory module
A switch is connected in channel selection switch out, to be sent to after being handled the pumping signal for corresponding to the storage of excitation memory block
Corresponding switch in output channel selection switch；An acquisition in every road acquisition signal processing module and data memory module stores
Area be connected, to by output channel selection switch in it is corresponding switch transmission sensor acquisition signal handled after sends
To corresponding acquisition memory block；
The data memory module include multiple excitation memory blocks identical with pressure sensor quantity in A ring or B ring and
Memory block is acquired, multiple excitation memory blocks and multiple acquisition memory blocks and is connected respectively with MCU controller, each excitation memory block
To store sensor excitation signal all the way, each acquisition memory block is to store sensor acquisition signal all the way；
Module occurs with frequency for the MCU controller and communication module is connected, to read the excitation letter of excitation memory block
Number and be sent to pumping signal processing module；Communication mould is sent to by the acquisition signal for acquiring the sensor of memory block storage
Block；Control instruction is sent with module occurs to frequency, module is occurred by frequency and changes excitation and sample frequency；And to input
Channel selection switch and output channel selection switch sendaisle select control instruction；
The communication module is connected with PC machine, the sensor acquisition signal of MCU controller to be sent in PC machine, with
The position of display pipes defect.
Further, every road pumping signal processing module includes D/A converter, filter and power amplifier,
The D/A converter is connected with filter, the pumping signal of memory block will be motivated to carry out digital-to-analogue conversion, concurrently
It send to filter；
The filter is connected with the power amplifier, filters to the pumping signal after converting D/A converter
Power amplifier is sent to after wave processing；
A switch in the power amplifier and output channel selection switch is connected, to by filtered pumping signal
Amplify processing.
Further, the every road acquisition signal processing module includes filter, programmable amplifier and A/D converter,
The filter is connected with the programmable amplifier, to switch the biography sent in input channel selection switch one
Sensor acquisition signal pumping signal is sent to programmable amplifier after being filtered；
The programmable amplifier is connected with the A/D converter, the sensor after filter process is acquired signal
A/D converter is sent to after carrying out programming amplifying processing；
The A/D converter is connected with the acquisition memory block, to acquire programmable amplifier treated sensor
Signal is sent to acquisition memory block after carrying out analog-to-digital conversion.
Further, the programmable amplifier includes first order operational amplification circuit, bandwidth-limited circuit, decaying rank
Selection circuit and second level operational amplification circuit,
The first order operational amplification circuit is connected with bandwidth-limited circuit, to amplify sensor acquisition signal
Bandwidth-limited circuit is sent into after processing；
The bandwidth-limited circuit is connected with the decaying class selection circuit, to filter out through first order operation amplifier electricity
High frequency spurs signal and low frequency spur signal in treated on road signal；
The decaying class selection circuit is connected with the second level operational amplification circuit, at will be through bandpass filter
Signal after reason carries out the attenuation processing of different stage；
The second level operational amplification circuit, the signal after attenuation processing is carried out secondary enhanced processing.
Further, the bandpass filter includes series resonant circuit and coupled active high-pass filter.
Further, the decaying class selection circuit includes multiple series resistance division modules and coupled more
Select an analog switch.
Further, the output channel selection switch includes multiple relay switches, and every two relay switch is one
Group, one of them is connected with a sensor in A ring, another is connected with a sensor in B ring.
Further, the input channel selection switch includes multiple analog switches, and each analog switch uses two-way four
An analog switch is selected, wherein an input terminal all the way is connected with a sensor in A ring, an input terminal and a sensor phase in B ring
Even, output end is connected with acquisition signal processing module；The input terminal of another way is connected with a sensor in A ring, an input terminal and B
A sensor is connected in ring, and output end is connected with acquisition signal processing module.
Further, the analog switch uses 74HCT4052 chip.
Further, multiple pressure sensors of the A ring and B ring use piezoelectric ceramic piece, and angularly symmetrical point
Cloth is on pipeline.
A kind of multi-channel parallel excitation of multi-frequency switching provided by the invention and the pipe detection system of acquisition can be freely
Selection needed for driving frequency to adapt to different types of pipeline and defect, and the output signal under different frequency is smoothly steady
It is fixed, undistorted phenomenon；Can also multi-channel parallel excitation and acquisition, and motivate it is synchronous with acquisition progress, detection efficiency height.
Detailed description of the invention
Fig. 1 is the pipe detection of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching provided in an embodiment of the present invention
The structural block diagram of system；
Fig. 2 is the circuit diagram of the programmable amplifier of acquisition signal processing module provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of output channel selection switch provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of input channel selection switch provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram that module occurs for frequency provided in an embodiment of the present invention.
Specific embodiment
In order to make those skilled in the art better understand the technical solution in the embodiment of the present invention, and make of the invention real
The above objects, features, and advantages for applying example can be more obvious and easy to understand, below by drawings and examples, to technology of the invention
Scheme is described in further detail.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of all other embodiment obtained, shall fall within the protection scope of the present invention.
Fig. 1 is the pipe detection of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching provided in an embodiment of the present invention
The structural block diagram of system.
As shown in Figure 1, the pipe of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching provided in an embodiment of the present invention
Road detection system includes sensor module 1, channel selection switch 2, signal processing module 3, data memory module 4, MCU controller
5, module 6, communication module 7 and power supply module 8 occur for frequency.
Sensor module 1 includes A ring and B ring, and A ring and B ring include the identical multiple pressure sensors of quantity, A ring it is more
Multiple pressure sensors of a pressure sensor and B ring and multiple switch in output channel selection switch are corresponding connected, but connect
When only one ring, A ring or B ring.Multiple pressure sensors of A ring and multiple pressure sensors of B ring and input channel select
Multiple switch is corresponding in switch is connected, but only one ring when connection, A ring or B ring, if output channel connects A ring, (i.e. A ring is made
To motivate ring), then input channel connects B ring (i.e. B ring is as reception ring).If output channel connects B ring, (i.e. B ring is as excitation
Ring), then input channel connects A ring (i.e. A ring is as reception ring).If A ring in the present embodiment and B ring use 4 pressure sensors,
4 are of course not solely limited to, can also be other quantity.4 pressure sensors of A ring and B ring are angularly uniformly arranged on pipeline,
Piezoelectric ceramic piece can be used in pressure sensor.
Channel selection switch 2 includes output channel selection switch 21 and input channel selects switch 22, output channel selection
Switch includes multiple switch, and quantity is that (i.e. A ring and B ring use 4 pressure for twice of pressure sensor quantity in A ring or B ring
Sensor, then output channel selection switch includes 8 switches), the control signal to be sent according to MCU controller controls A ring
Or B ring is as excitation ring (4 sensors that i.e. 4 sensors are connected or controlled in B ring in control A ring are connected).Input channel
Selecting switch 22 includes multiple switch, and quantity is that (i.e. A ring and B ring are using 4 for twice of pressure sensor quantity in A ring or B ring
A pressure sensor, then input channel selection switch includes 8 switches), to the control signal control sent according to MCU controller
A ring or B ring processed are as reception ring (4 sensors that i.e. 4 sensors are connected or controlled in B ring in control A ring are connected).Its
In, logic control signal are as follows: if A ring is as excitation ring, B ring is as reception ring；If B ring is as ring is received, A ring is as sharp
Encourage ring.
Signal processing module 3 includes multichannel pumping signal processing module identical with pressure sensor quantity in A ring or B ring
31 motivate memory block with one in data memory module 4 with acquisition signal processing module 32, every road pumping signal processing module 31
41 are connected with a switch in output channel selection switch 21, will correspond at the pumping signal that excitation memory block 41 stores
Corresponding switch in output channel selection switch 21 is sent to after reason.Every road acquisition signal processing module 32 and data memory module
An acquisition in 4 and is connected at memory block 42, to select the corresponding sensor transmitted that switchs in switch 21 to adopt output channel
Collection signal is sent to corresponding acquisition memory block 42 after being handled.
Wherein, every road pumping signal processing module 31 includes D/A converter 311, filter 312 and power amplifier 313,
D/A converter 311 is connected with filter 312, the pumping signal of memory block 41 will be motivated to carry out digital-to-analogue conversion, and is sent to
Filter 312.Filter 312 is connected with power amplifier 313, carries out to the pumping signal after converting D/A converter 311
Power amplifier 313 is sent to after filtering processing.Power amplifier 313 and the switch phase in output channel selection switch 21
Even, to be exported again after filtered pumping signal is amplified processing.
Every road acquisition signal processing module 32 includes filter 321, programmable amplifier 322 and A/D converter 323, filtering
Device 321 is connected with programmable amplifier 322, to select the sensor that a switch is sent in switch 22 to acquire signal input channel
Pumping signal is sent to programmable amplifier 322 after being filtered.Programmable amplifier 322 is connected with A/D converter 323, uses
To be sent to A/D converter 323 after treated the sensor acquisition signal of filter 321 is carried out programming amplifying processing.A/D turns
Parallel operation 323 is connected with acquisition memory block 42, treated the sensor acquisition signal of programmable amplifier 322 is carried out modulus turn
Acquisition memory block 42 is sent to after changing.
Data memory module 4 includes multiple excitation memory blocks 41 identical with pressure sensor quantity in A ring or B ring and adopts
Collecting memory block 42, (i.e. A ring and B ring use 4 pressure sensors, then memory block 41 and acquisition memory block 42 is motivated to respectively include four
A area), multiple excitation memory blocks 41 and multiple acquisition memory blocks 42 and it is connected respectively with MCU controller 5, each excitation memory block
41 to store sensor excitation signal all the way, and each acquisition memory block 42 is to store sensor acquisition signal all the way.
Module 6 occurs with frequency for MCU controller 5 and communication module 7 is connected, to read excitation letter from excitation memory block 41
Number, pumping signal is passed into pumping signal processing module 31.And the acquisition signal that the sensor that memory block 42 stores will be acquired
It is sent to communication module 6.MCU controller 5 is also used to input channel selection switch and output channel selection switch output channel
Selection control instruction is to control the type of A ring and B ring, for example, controlling 4 sensors and output channel selection switch 21 of A ring
Corresponding 4 switches connection, 4 sensors, 4 switches corresponding with input channel selection switch 22 for controlling B ring are connected to, make
A ring is obtained as excitation ring, B ring is as reception ring.Or 4 sensors of control B ring are corresponding with output channel selection switch 21
The connection of 4 switches, the corresponding 4 switches connection of 4 sensors and input channel the selection switch 22 of A ring is controlled, so that B ring
As excitation ring, A ring is as reception ring.MCU controller 5 is also used to that module 6 occurs to frequency to send control instruction, passes through frequency
Module 6 occurs and changes excitation and sample frequency.
Communication module 7 is connected with PC machine, the sensor acquisition signal of MCU controller 5 to be sent in PC machine, with aobvious
Show the position of defect of pipeline.USB communication module or wireless communication module can be used in communication module.
Power supply module 8 is mainly responsible for the power supply of whole system.
By taking A ring and B ring are using 4 sensors as an example, the course of work of the invention are as follows:
The type and excitation and sample frequency of the output control instruction selection A ring of MCU controller 5 or B ring, if control A ring
As excitation ring, B ring as ring is received, then MCU controller 5 is read respectively from 4 excitation memory blocks 41 in data memory module 5
Pumping signal is taken, then each pumping signal is respectively fed to corresponding pumping signal processing module 31 and carries out signal processing, processing
4 tunnel pumping signals afterwards select 4 switches in switch to export by the output channel being connected to 4 sensors of A ring respectively, make
The ultrasound signal transmission of 4 pressure sensors vibration generations of A ring is obtained to 4 pressure sensors of B ring, 4 pressure of B ring pass
Sensor is by the pressure signal of acquisition by selecting 4 switches in switch 22 to be transmitted to corresponding adopt with the input channel that it is connected
Collect signal processing module 32 and carries out signal processing, treated, and each road acquisition signal is stored to corresponding acquisition memory block 42, by
MCU controller 5 reads acquisition information from acquisition memory block 42 and is transmitted to PC machine by communication module 6, by PC machine display pipes
Defective locations.
Fig. 2 is the circuit diagram of the programmable amplifier of acquisition signal processing module provided in an embodiment of the present invention.
As shown in Fig. 2, programmable amplifier 322 includes first order operational amplification circuit 3221, bandpass filtering in the present embodiment
Circuit 3222, decaying class selection circuit 3223 and second level operational amplification circuit 3224.First order operational amplification circuit 3221
Be made of resistance R1, R2, U1A and R3, bandwidth-limited circuit 3222 include resistance R4, C1, L1 constitute series resonant circuit and
The active high-pass filter that C3, R5, R6, U2 are constituted, the resonance frequency of series resonant circuit are 300KHz, quality factor q 35,
The high frequency spurs of 250-350KHz can be filtered off, active high-pass filter can filter out low frequency spur signal.Decaying class selection circuit
3223 include the series resistance division module that tetra- resistance of resistance R8-R11 are constituted and analog switch DG408DY, DG408DY are one
A 8 select 1 analog switch, enable end EN are connect high level, A2 ground connection selects one end and the output end D of S1-S4 by A1 and A0
Be connected, it can be achieved that different stage decaying.Second level operational amplification circuit 3224 is made of resistance R12, R13, R14 and U1B.
Sensor acquires signal VINn and amplifies about 10 times of feeding bandwidth-limited circuits 3222 progress high frequencies by amplifier U1A
Clutter and low frequency spur filter out, and the signal after being filtered enters decaying class selection circuit and carries out attenuation processing, at decaying
Signal after reason enters U1B and amplifies about 10 times again.
Fig. 3 is the circuit diagram of output channel selection switch provided in an embodiment of the present invention.
As shown in figure 3, the voltage due to pumping signal is higher, and to meet sensor ring A ring B ring and can alternately realize and swash
Encourage with acquisition function, therefore output channel selection switch 21 selection 8 relay switches, every two relay switch be one group,
In one be connected with a sensor in A ring, another is connected with a sensor in B ring.As shown in Figure 3, RL1-
RL8 is the control signal that MCU controller issues, and low level is effective, and the cathode of light emitting diode is connected to by resistance, luminous two
The anode of pole pipe is connected with the base stage of triode, and the emitting stage of triode connects+5V voltage source, collector connecting relay.SW1-SW4
It is the pumping signal that output channel signal processing module issues.A1-A4 is connected on the pressure sensor of A ring, and B1-B4 is connected to
On the pressure sensor of B ring.When RLn is low level, the base stage of triode Qn is pulled low, and Qn conducting, corresponding relay is inhaled
It closes, pumping signal is reached by SWn completes to motivate on A or B ring.
Fig. 4 is the circuit diagram of input channel selection switch provided in an embodiment of the present invention.
As shown in figure 4, since the collection voltages of input channel 6 are smaller, therefore input channel selection switch selects simulation electronic
Switch, each analog switch select an analog switch 74HCT4052 chip, one of 74HCT4052 chip one using two-way four
The one input terminal 1Y0 on road is connected with a sensors A 1 in A ring, and an input terminal 1Y1 is connected with a sensor B1 in B ring, output end
1Z is connected with acquisition signal processing module.The input terminal 2Y0 of another way is connected with a sensors A 2 in A ring, an input terminal 2Y1 with
A sensor B2 is connected in B ring, and output end is connected with acquisition signal processing module.Another 74HCT4052 chip all the way one
Input terminal 1Y0 is connected with a sensors A 3 in A ring, and an input terminal 1Y1 is connected with a sensor B3 in B ring, output end 1Z with adopt
Collect signal processing module to be connected.The input terminal 2Y0 of another way is connected with a sensors A 4 in A ring, in an input terminal 2Y1 and B ring
One sensor B4 is connected, and output end is connected with acquisition signal processing module.
74HCT4052 chip is that a two-way 4 selects 1 analog switch, works as enable endWhen for low level, by configure S0 and
The end S1 low and high level selection 1Yn is connected with 1Z, and 2Yn is connected with 2Z.In the present embodimentIt is grounded with the end S1, is low level, institute
Need to only control the end S0 level, on state isFor low level, when S0 is low level, A1-A4 gating, when S0 is height
When level, B1-B4 gating.
Fig. 5 is the circuit diagram that module occurs for frequency provided in an embodiment of the present invention.
As shown in figure 5, module 6 occurs for frequency using single-chip microcontroller STC12C5410AD-20, the excitation of use in the present embodiment
Frequency is 40-180KHz, and MCU controller 5 gives the P3.2/ of single-chip microcontroller STC12C5410AD-20Mouth sends a low level
Pulse signal makes it into external interrupt, and the numerical value that STC12C5410AD-20 reads P1 mouthfuls enters its internal corresponding frequency conversion
Program changes P3.7 mouthfuls of low level pulse width, to change the frequency that MCU controller 5 enters external interrupt, excitation and
Therefore sample frequency also changes.
To sum up each embodiment, a kind of pipeline inspection of the multi-channel parallel excitation of multi-frequency switching and acquisition provided by the invention
Examining system can select required driving frequency freely to adapt to different types of pipeline and defect, and the output under different frequency
Signal smoothing is stablized, undistorted phenomenon；Can also multi-channel parallel excitation and acquisition, and motivate it is synchronous with acquisition progress, detect imitate
Rate is high.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of pipe detection system of the multi-channel parallel excitation and acquisition of multi-frequency switching characterized by comprising sensing
Module and communication mould occur for device module, channel selection switch, signal processing module, data memory module, MCU controller, frequency
Block,
The sensor module includes A ring and B ring, and the A ring and B ring include the identical multiple pressure sensors of quantity, the A
Multiple pressure sensors of ring and multiple pressure sensors of B ring and multiple switch in output channel selection switch are corresponding connected；
Multiple pressure sensors of the A ring and multiple pressure sensors of B ring are corresponding with multiple switch in input channel selection switch
It is connected；
The channel selection switch includes output channel selection switch and input channel selection switch, and the output channel selection is opened
Closing includes multiple switch, and quantity is twice of pressure sensor quantity in A ring or B ring, to what is sent according to MCU controller
Signal control A ring or B ring are controlled as excitation ring；Input channel selection switch includes multiple switch, quantity be A ring or
Twice of pressure sensor quantity in B ring, control signal control A ring or B ring to be sent according to MCU controller, which are used as, to be received
Ring；
The signal processing module includes multichannel pumping signal processing module identical with pressure sensor quantity in A ring or B ring
With acquisition signal processing module, every road pumping signal processing module motivates memory block and output logical with one in data memory module
A switch is connected in road selection switch, to be sent to output after being handled the pumping signal for corresponding to the storage of excitation memory block
Corresponding switch in channel selection switch；An acquisition memory block in every road acquisition signal processing module and data memory module and
It is connected, to be sent to pair after being handled the sensor acquisition signal of switch transmission corresponding in output channel selection switch
The acquisition memory block answered；
The data memory module includes multiple excitation memory blocks identical with pressure sensor quantity in A ring or B ring and acquisition
Memory block, multiple excitation memory blocks and multiple acquisition memory blocks and be connected respectively with MCU controller, each excitation memory block to
Sensor excitation signal, each acquisition memory block acquire signal to store sensor all the way all the way for storage；
Module occurs with frequency for the MCU controller and communication module is connected, to read the pumping signal of excitation memory block simultaneously
It is sent to pumping signal processing module；Communication module is sent to by the acquisition signal for acquiring the sensor of memory block storage；With
Module occurs to frequency and sends control instruction, module is occurred by frequency and changes excitation and sample frequency；And to input channel
Selection switch and output channel selection switch sendaisle select control instruction；
The communication module is connected with PC machine, the sensor acquisition signal of MCU controller to be sent in PC machine, with display
The position of defect of pipeline.
2. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 1,
It is characterized in that, every road pumping signal processing module includes D/A converter, filter and power amplifier,
The D/A converter is connected with filter, the pumping signal of memory block will be motivated to carry out digital-to-analogue conversion, and is sent to
Filter；
The filter is connected with the power amplifier, is filtered place to the pumping signal after converting D/A converter
Power amplifier is sent to after reason；
The power amplifier is connected with the switch in output channel selection switch, to carry out filtered pumping signal
Enhanced processing.
3. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 1,
It is characterized in that, the every road acquisition signal processing module includes filter, programmable amplifier and A/D converter,
The filter is connected with the programmable amplifier, to switch the sensor sent in input channel selection switch one
Acquisition signal pumping signal is sent to programmable amplifier after being filtered；
The programmable amplifier is connected with the A/D converter, to carry out the sensor acquisition signal after filter process
A/D converter is sent to after programming amplifying processing；
The A/D converter is connected with the acquisition memory block, programmable amplifier treated sensor is acquired signal
Acquisition memory block is sent to after carrying out analog-to-digital conversion.
4. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 3,
It is characterized in that, the programmable amplifier includes first order operational amplification circuit, bandwidth-limited circuit, decaying class selection circuit
With second level operational amplification circuit,
The first order operational amplification circuit is connected with bandwidth-limited circuit, sensor acquisition signal is amplified processing
After be sent into bandwidth-limited circuit；
The bandwidth-limited circuit is connected with the decaying class selection circuit, to filter out through at first order operational amplification circuit
High frequency spurs signal and low frequency spur signal in signal after reason；
The decaying class selection circuit is connected with the second level operational amplification circuit, to will be after bandpass filter is handled
Signal carry out different stage attenuation processing；
The second level operational amplification circuit, the signal after attenuation processing is carried out secondary enhanced processing.
5. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 4,
It is characterized in that, the bandpass filter includes series resonant circuit and coupled active high-pass filter.
6. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 4,
It is characterized in that, the decaying class selection circuit includes that multiple series resistance division modules and coupled multiselect one are simulated
Switch.
7. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 1,
It is characterized in that, the output channel selection switch includes multiple relay switches, every two relay switch is one group, wherein
One is connected with a sensor in A ring, another is connected with a sensor in B ring.
8. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 1,
It is characterized in that, the input channel selection switch includes multiple analog switches, each analog switch selects a mould using two-way four
Quasi- switch, wherein an input terminal all the way is connected with a sensor in A ring, an input terminal is connected with a sensor in B ring, output
End is connected with acquisition signal processing module；The input terminal of another way is connected with a sensor in A ring, one in an input terminal and B ring
Sensor is connected, and output end is connected with acquisition signal processing module.
9. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 8,
It is characterized in that, the analog switch uses 74HCT4052 chip.
10. the pipe detection system of the multi-channel parallel excitation and acquisition of a kind of multi-frequency switching according to claim 1,
It is characterized in that, multiple pressure sensors of the A ring and B ring use piezoelectric ceramic piece, and angularly it is symmetrically distributed in pipe
On road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811457209.5A CN109490415A (en) | 2018-11-30 | 2018-11-30 | A kind of pipe detection system of the multi-channel parallel excitation and acquisition of multi-frequency switching |
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